Hello, I am experiencing a problem with CSLA that didn't seem to be in the forums, until last week when someone else was experiencing the same problems as me. the post the question is in is marked with a suggested answer so this might be the reason why you have not seen it. however I am reposting...

Well, they are and they aren't. They're obsolete really because of Wpf and SL, and WinForms is now being considered legacy technology. But if you're still on WinForms, you should continue to use those classes if needed, because WinForms doesn't understand Linq.